my phone's screen automatically turns off.

[SamsungUser111000]

Hello, My phone's screen is automatically being locked repeatedly, like if someone's pressing the power button repeatedly and abruptly. But after I restart my device, it works fine for some time but the problem still persists. 

Need solution to this problem

My device: Samsun J7 core. 

[Saadi121]

Turn off auto restart

[SamsungUser111000]

it's not enabled, However it doesn't restart by itself.
jese hum power off wala button press krte hen wese bar bar off and on hoti hai screenlock.

[Saadi121]

Oh ya sb models main hota vibration ki waja sy

[SamsungUser111000]

bhai pehle nahi hota tha.. or yeh laafi irritating hai.. restart krne k bad thek hojata hai

[Saadi121]

G mra b